Results 31 to 40 of about 49,023 (273)
The Astrophysical Journal Letters, 2023 We use recent microlensing observations toward the central bulge of the Galaxy to probe the overall stellar plus brown dwarf initial mass function (IMF) in these regions well within the brown dwarf domain. We find that the IMF is consistent with the same
Gilles Chabrier, Romain Lenoble
doaj +1 more source
The Substellar Transition Zone: A Stretched Temperature Canyon in Brown Dwarf Population due to Unsteady Hydrogen Fusion [PDF]
, 2018 I summarize results on transitional and degenerate brown dwarfs presented in a series titled Primeval very low-mass stars and brown dwarfs. I introduce an L subdwarf classification scheme, which classified L subdwarfs into three metal subclasses. I would also like to draw your attention to transitional brown dwarfs which have long-lasting unsteady ...
arxiv +1 more source
A Small Brown Dwarf in an Aligned Orbit Around a Young, Fully Convective M Star
The Astronomical JournalA star's spin–orbit angle can give us insight into a system's formation and dynamical history. In this paper, we use MAROON-X observations of the Rossiter–McLaughlin effect to measure the projected obliquity of the LP 261-75 (also known as TOI-1779 ...
Madison Brady +8 more
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The Astronomical Journal, 2023 Using a sample of 361 nearby brown dwarfs, we have searched for 4.6 μ m variability, indicative of large-scale rotational modulations or large-scale, long-term changes on timescales of over 10 yr.
Hunter Brooks +11 more
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Listening to Hong Kong children's perspectives through pretend play
British Educational Research Journal, EarlyView.Abstract Quality in early childhood education and care (ECEC) has become an increasing concern in recent years. The issue has been regularly discussed by different stakeholders. However, the rising concern regarding quality in ECEC has not seriously taken into account children's perspectives.
Suzannie K. Y. Leung
wiley +1 more source
The Astrophysical JournalIrradiated brown dwarfs offer a unique opportunity to bridge the gap between stellar and planetary atmospheres. We present high-quality Hubble Space Telescope/Wide Field Camera 3/G141 phase-resolved spectra of the white dwarf–brown dwarf binary GD 1400 ...
Rachael C. Amaro +10 more
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EPJ Web of Conferences, 2011 From radial velocity (RV) detections alone one does not get all orbital parameters needed to derive the true mass of a non-transiting, unresolved substellar companion to a star.
Kürster M., Meyer E.
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Widening participation in outward student mobility: Successes, challenges and opportunities
British Educational Research Journal, EarlyView.Abstract This article utilises data obtained through evaluation processes at Northumbria University to contribute to the emerging discourse on widening participation and outward student mobility. The rationale behind the study stems from the significant financial and non‐financial benefits associated with higher education and the UK's ongoing efforts ...
Joseph Mellors, Alejandra Vicencio
wiley +1 more source
The Astrophysical Journal LettersWe present JWST/Mid Infrared Instrument (MIRI) low-resolution spectroscopy (4.75–14 μ m) of the first known substellar companion, Gliese 229Bab, which was recently resolved into a tight binary brown dwarf.
Jerry W. Xuan +10 more
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Time-resolved Optical Polarization Monitoring of the Most Variable Brown Dwarf
The Astronomical Journal, 2023 Recent atmospheric models for brown dwarfs suggest that the existence of clouds in substellar objects is not needed to reproduce their spectra, nor their rotationally induced photometric variability, believed to be due to the heterogeneous cloud coverage
Elena Manjavacas +5 more
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